I think it is technically incorrect to refer to these recordings as "Healy Matrix." In all other instances where the word Matrix is used to describe a recording, it means that the sound board and an audience tape have been faded together to create a composite recording - two sources combined into one. In the case of these "Healy" tapes, the sound board mixed microphones that were located in the area of the board into the master tape. That is, one source created these tapes. They are, simply, board tapes with crowd ambience - exactly like a show that was recorded with the intention of a commercial release. By 1987, the band probably realized that there would be a market for every show, not just those released on a labeled live album, and chose to create tapes for that purpose rather than the dry, straight from the board, archival recordings they had made for so long.

Glad I waited almost 30 years to grab this version. Really sounds good. Thanks for all your efforts!